How To Select 2 Accounts to Sync

From "Accounts," select the 2 accounts that you would like to sync. Typically, you would select to sync your Google account with your iCloud contacts.

The "Accounts" menu is accessible from the tab bar at the bottom left of your screen.

Step 1: Sign into Google account

Sign into the Google account that you would like to sync, and grant the app access to your contacts.

Video showing how to grant the app access to your Google contacts:

Step 2: Select an iPhone Account

In order for your Google groups to be visible on your iPhone, you must sync Google with either iCloud or local iPhone contacts.

Choose from one of the following iPhone account settings:

Auto (Recommended)

In this mode, if you have an iCloud account, your iCloud contacts will be synced with Google. Otherwise, your local iPhone contacts will be synced with Google. Otherwise, in the absence of iCloud and a local account, one of your other accounts will be chosen.

iCloud/iPhone/Yahoo/CardDAV/Exchange

Gives you the option of specifying a specific account, such as an iCloud account, a local iPhone account, or an Exchange account

All

In this mode, all of your iPhone contact accounts will be synced with Google with the exception of Facebook.

If you find that some of your iPhone contacts are not appearing in Google, simply go to Contacts Sync > Accounts > iPhone Account to Sync, and choose "All." Then sync once again.